Bahaha...Melbourne??
Did the dodgy looking bloke at the Collingwood swapmeet on Sunday give you a funny blank look and say "un-rocking???"
I used to know of one or two places that could do it for you, but they have disappeared now. The best thing to do is read up in the forums about how to do it, and then grab the materials that you need yourself. You could try places like Jaycar, Radio Parts (try the one on Princess Highway, Carnegie) or Tandy (yuck) for conductive pens (DON'T go to Dick Smith), but for pit filler material, that will be depending on what you are going to use.